A compact seismic sensor has been fabricated by supporting a seismic mass between two fiber-wrapped rubber mandrels which form the two arms of a Michelson interferometer. This sensor has a sensitivity of 104 raft below resonance and 3500 rad/gm above resonance, is easy to fabricate, easy to modifiy for other applications, uses less than fifteen meters of sensing fiber, and has a detection threshold limited by its own intrinsic thermal noise (= 2 μrad/√Hz below resonance) rather than the opto-electronic demodulator noise.
Fiber Optic Seismic Sensor
Fiber Optic and Laser Sensors V ; 1986 ; San Diego,CA,United States
Proc. SPIE ; 0838
1988-03-23
Conference paper
Electronic Resource
English
Fiber optic sensors for seismic monitoring
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